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Questions tagged [dtmf]

Related to transmitting or receiving Dual-Tone Multi-Frequency (DTMF) signaling, a technology used in analog telephony.

Related to transmitting or receiving Dual-Tone Multi-Frequency (DTMF) signaling, a technology used in analog telephony.

217 questions
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Detect DTMF Tones C#

I have wav file in which using the naudio lib i have been able to get raw data out of the wav files. Does any one know how to loop though the data in chuncks detecting DTMF tones?
Jonathan D
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Uplink DTMF tone generation

Is there any way I can dynamically generate uplink DTMF tone (ie the receiver hears it)? When I looked at the android source code I saw a function called startDTMF() which is exactly what I need, but I couldn't find any API that allows me to access…
Michae1
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Java (J2SE) DTMF tone detection

I am trying to do the following I am getting a call to another person using my java application (Already done & works fine). Then I am playing a recording, for example "Please press 1 one to continue in english" (Already done & works fine). …
Rakitha Fernando
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Is there any way of sending DTMF tones during a call with linphone?

I'm trying to send a sequence of DTMF tones during a SIP call from linphone, compiled for the iPhone, in order to do some call management at a local exchange I've set up. I see from the code that the individual digits send DTMF (without audio on the…
FractalDoctor
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Is it possible to detect DTMF tones using C#

I am trying to detect caller id information from telephone line. The caller-id information received is in DTMF tones (not FSK). How can I detect this DTMF tones ? Is Phone and Fax Modem capable of it ? The Phone and Fax Modem is capable of detecting…
Marshal
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Twilio not detecting DTMF tones from Skype

Twilio not detecting my DTMF tones from Skype. We have setup an IVR system with twilio whereby clients must enter a 7 digit client number. Some of our clients phone from voip phones, therefore we need to ensure that twilio can detect the DTMF…
Neon
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"RFC 2833 RTP Event" Consecutive Events and the E "End" Bit

Why do I get a dtmf sound when the E bit is 0 and no sound when it is 1? (RTP packets appear in wireshark either way) Background: I can send out a RFC 2833 dtmf event as outlined at http://www.ietf.org/rfc/rfc2833.txt obtaining the following…
brian_d
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Android pjsip DTMF codes not sending

Starting from the example found here: https://trac.pjsip.org/repos/wiki/Getting-Started/Android , I managed to build and run the pjsua2 sample application. The problem is that I can't send DTMF codes, they appear in logcat but they aren't sent at…
Razvan
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identifying the DTMF tones in android

I m planning to create a centrex system app in android. In which there is a voice mail will set in the receiver side. By the instructions in the voice mail, caller has to press the number in the dial pad, receiver side should identify the number and…
user2286386
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What is the purpose of using DTMF in sip based softphone?

DTMF is used in some sip based softphone to handle payload type. But the process and the importance of using DTMF is not clear to me. Open source softphone like Red5phone and Sipdroid uses DTMF. Would anyone please explain the issue or point me…
S. M. Shahinul Islam
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TAPI application, can't send DTMF signal

I'm trying to write an aplication that makes a modem connection and after that sends a dtmf signal. My application creates a call but it doesnt send that DTMF signal. I'm writing it in C# using TAPI. What is wrong in that code ?? At button 3 u can…
Tyrril
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Custom dialler, how can I send "1" or "2" via the call. For when you call a customer service and they need input

So I have this code, that takes my current call and plays the DTMF tone: if (CallManager.currentCall != null) { when (pressed) { 10 -> CallManager.currentCall?.playDtmfTone("*".toCharArray()[0]) 11 ->…
rosu alin
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Getting java.lang.ClassCastException while sending DTMF tones over an active call in android

I am developing an app that sends DTMF tones over an active call in android. I searched a lot to implement this feature in my app and i found this : com.android.internal.telecom.IInCallAdapter interface that extends android.os.IInterface. There is…
Algor7
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DTMF monitoring via multimon, awk and espeak

How to listen to the spoken DTMD digit every time the sound card capture one? The objective is radio controlling my pc and interfaces activities dialing dtmf tones via a hand-held transceiver. I used multimon to hear DTMF tones I tried to use awk…
m33600
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Receiving DTMF tone from a call in android

I am developing an android application where I want to make use of DTMF tones over a active call. I want to send and receive DTMF tones when I make a call through my android application. DTMF tone will be send over a call through a button click.…
user3089867
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